Enable vendorcode measured and verified boot.
Use VBOOT test key for VENDORCODE_ELTAN_VBOOT_KEY_FILE
BUG=N/A
TEST=booting Embedded Linux 4.20 kernel on Facebook FBG1701
Change-Id: Ia2cb3bb873b2d5e7e9031e5b249d86605d8e0945
Signed-off-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34343
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
